Question about Kenmore 25512/ 25513 Progressive Canister Vacuum

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Smells like burning

I turn the vacuum on and withing seconds smell burning. That is without the handle, the actual brush that we use for vacuuming. That is not connected so it is not the roller, or the rubber band that holds it. I has to be the motor. Coincidentally, I just put a new bag in, and I used an off brand, but it fits and it does not seem to be coming from there. It is not making any odd noises.

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We had this same issue. I noticed it smells like burning plastic. I took it apart and did not find any fundamental problems. Ball bearings on motor are fine, no play. What I did find was that the motor construction contains lots of plastic. It's made in China. Even the brush holder is plastic. Now, this is unusual to me, as brushes get very hot. However, I did not find any issues of melted or softening plastic when running. I used a laser-guided thermometer and measured about 170 degrees F on the metal portion of the brush holder. Nothing unusual. Some parts reached above 200 degrees F. Again, nothing unusual. The only unusual issue is that many of the parts are mated with plastic parts. That's where I believe the problem lies. When the motor is new, the brushes don't make full contact. Therefore, full power draw is not achieve until these brushes wear down a bit. After this point, the brushes reach maximum power delivery and reach maximum temperatures. This is why I believe the vacuum didn't exibit any smell until a few months later, at least, for us. In conclusion, I didn't find anything wrong, except that the motor is cheaply constructed. It isn't going bad and well likely last quite a while, IMHO.
MAJ

Posted on Jul 18, 2010

  • digtal_dremr Jul 18, 2010

    Additionally, I'll mention that I measured the ampere draw of the motor when running and it was under 9 amps most of the time, well within specs. The specifications refer to it as a 10 amp motor.
    This indicates that the motor was not dragging, pulling hard, and didn't have a shorted field or armature winding. Everything checked out okay - except for the plastic brush holders. LOL!
    MAJ

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